Effects of dehulled soybean meal as a fish meal replacer in diets for fingerling and growing Korean rockfish Sebastes schlegeli

Abstract

Two feeding trials were conducted to determine the proper inclusion level of dehulled soybean meal (DHSM) as a fish meal replacer and to get the information on the long-term effects of fish meal (FM) replacement by DHSM in Korean rockfish diets. All the experimental diets were formulated to be isonitrogenous (48% crude protein, CP) and isocaloric (16.0 kJ energy g −1 diet). In the first experiment, triplicate groups of 40 fish averaging 2.5±0.04 g (mean±S.D.) were fed one of eight experimental diets for 8 weeks. In the second experiment, triplicate groups of 20 fish averaging 21.5±0.05 g (mean±S.D.) were fed one of six experimental diets for 12 weeks. In the first experiment, based on the growth performance, we concluded that DHSM could replace FM up to 20% without amino acid (AA: methionine, lysine) supplementation and 30% with amino acid supplementation in fingerling and growing Korean rockfish. These conclusions were further confirmed in the second experiment.